研究了液相烧结的90W-7Ni-3Fe合金的形变和断裂特征。试样由基体相首先开始屈服,承受塑性变形。当界面结合强度较低时,试样首先沿界面裂开,而当界面结合强度增高到高于钨的解理断裂应力时,试样同时发生钨球的穿晶解理开裂和基体相的塑性撕裂。 氢是造成烧结试样界面脆化的重要原因之一。真空热处理能去除界面孔隙中的氢以及钨颗粒和基体相界面之中的氢,从而提高界面的结合强度,使试样的断裂强度和塑性同时得到提高。
The feature of deformation and fracture of a liquid phase sintered alloy 90W-7Ni-3Fe has been studied. It was found that the matrix of the alloy is the first to yield and to undergo plastic deformation. The cracks may be initiated along the W grain/matrix interfaces as the bonding force here is weak. While the bonding force is strengthened to a greater extent than the cleavage failure stress of W, the transgranular cleavage cracking of W grains and the plastic teaing of the matrix may happen simultaneously. Hydrogen is shown as one of the main sources of the inteffacial embrittlement of as-sintered specimen. The removal of the hydrogen both stored in the voids and dissolved in metals of the W grain/matrix interfaces is easily done by heat treatment under vacuum. Thereafter, the bonding force at interface as well as the tensile strength and plasticity of specimen can be modified.
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